$sprite_image_icons: unquote("icon-sprite.png")
=icon-sprite($img, $col: 1, $row: 0, $width: 16px, $height: 16px, $margin: 24px)
    $y: ($col - 1) * -$height - ($col - 1) * $margin
    $x: 0
    background: image_url($img) no-repeat $x $y
    height: $height

=icon-rss
    +icon-sprite($sprite_image_icons, 1, 1)
=icon-add
    +icon-sprite($sprite_image_icons, 2, 1)

